Duck hasn't walked in months

I have a white male duck who started out with bumble foot and was limping. I never had ducks before and did not realize he had bumblefoot until I researched it. I am assuming that I realized it too late since now he no longer walks, the leg is still swollen. I had him on antibiotics in his water, which he drank at first but stopped due to taste, I then resorted to giving it in a syringe. He stayed on the antibiotics for over a month with no result. This has been going on about 4 months. He eats, drinks, and will swim around if I put him in the small pond, but cannot walk. I don't want to put him down, but I am out of ideas. I even tried penicillin injections daily into breast muscle. I feel really sorry for him. He is just exciting. Any thoughts would be appreciated

Well, in the mean time, I would rub Neosporin on his scabs/wounds to prevent infection, although it sounds like he may already have an infection going on. I can't really say more until I can see pictures of his leg and foot. Is he only having trouble with one foot or both?

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That’s odd. The underside of his foot looks good. The top view makes it look like a malformation, but I guess that could be from not walking? Aside from the scabbing, of course. Have you done a series of soaks?